Flexible Window Protective Layer for Foldable Displays
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Solution Overview
Problem
Flexible display devices require a window that maintains optical and mechanical properties while allowing for folding or bending, but existing solutions compromise on either durability or optical quality.
Innovation Solution
A window with a protective layer comprising a first fluorine-containing compound and a second fluorine-containing compound, including (meth)acrylate, vinyl, or epoxy groups, is used, which enhances both optical and mechanical durability, and is applied using a chemical vapor deposition polymerization method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer is added to improve mechanical durability, then impact resistance improves, but reflectance increases and optical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the protective layer by incorporating fluorine-containing compounds with specific molecular structures (Formula 1 and Formula 2). This composition modification reduces the refractive index of the protective layer, thereby reducing reflectance while maintaining mechanical durability. The fluorine-containing compounds provide both protective function and optical optimization through their unique molecular properties.
Solution Approach 2:
The patent uses a composite protective layer formed by combining multiple fluorine-containing compounds with different functional groups ((meth)acrylate, vinyl, epoxy, or oxetanyl groups). This composite material approach allows the protective layer to simultaneously achieve mechanical durability from the polymerizable reactive groups and reduced reflectance from the fluorine-containing molecular structures, resolving the contradiction between protection and optical quality.
2Strength
If the protective layer is made thicker to improve durability, then mechanical strength improves, but optical transmittance decreases
Solution Approach 1:
The patent optimizes the thickness parameter of the protective layer to a specific range (70 nm to 130 nm) and changes the material composition to fluorine-containing compounds. This dual approach allows the protective layer to achieve sufficient mechanical durability at a thinner thickness, thereby maintaining high optical transmittance. The fluorine-containing compounds provide high protective performance per unit thickness, enabling the layer to be thin yet durable.
3Strength
If a conventional protective layer is used to protect the display panel, then mechanical protection is achieved, but folding and bending characteristics are compromised
Solution Approach 1:
The patent employs a thin-film protective layer (70 nm to 130 nm) made of fluorine-containing compounds that can be deposited on flexible base layers. This thin-film structure provides mechanical protection while maintaining the flexibility needed for folding and bending operations. The molecular structure of the fluorine-containing compounds and the thin-film configuration allow the protective layer to flex without cracking or delaminating.
Solution Approach 2:
The patent changes the physical and chemical parameters of the protective layer including its thickness (70-130 nm), composition (fluorine-containing compounds), and molecular structure. These parameter changes enable the protective layer to achieve a balance between mechanical strength and flexibility, allowing it to protect the display panel while accommodating folding and bending operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The window exhibits improved mechanical durability, reduced reflectance, and enhanced optical properties, such as high transmittance and impact resistance, while maintaining flexibility for folding or bending.
Implementation Method 1
applied using a chemical vapor deposition polymerization method
Data Source
AI summary
A window including a base layer and a protective layer disposed on the base is presented. The protective layer includes a first fluorine-containing compound represented by Formula 1 below, wherein each of R1, R2, R3, R4, R5, R6, R7 and R8 is independently —(CH2)a—CF3, —(CF2)b—CF3, or a polymerizable reactive group, at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is a polymerizable reactive group, at least one other is —(CH2)a—CF3, or —(CF2)b—CF3, a is an integer of 1 to 30, and b is an integer of 0 to 30. The protective layer also includes a second fluorine-containing compound includes at least one of a (meth)acrylate group, a vinyl group, an epoxy group, or an oxetanyl group.